I buy a pot, buy a bonny lavender plant and plant it. I water it and watch as it sulks - grey and lack-lustre. Then lo' - some lavender self-seeds in an invisible crevice in a stone wall. And look at it!
I know this is called a 'gaura' because when my last one died - in the hard late frosts of last Winter - I was determined to track another one down. Lovely foliage, it grows fast and flowers from Spring to Autumn. What's not to like?